#include <iostream>

int main()
{
    enum weekday
    {
        sun,
        mon,
        tue,
        wed = 4,
        thu,
        fri,
        sat
    };
    weekday workday = mon;
    std::cout << workday + wed << std::endl; //5
    // int a[][3]={{1,1,1},{},{1,1}};
    char *a=0;
    // int *p=10;
    char str[5]="good";
    char st[20]="hello\0\t\\\\";
    std::cout<< strlen(st) << "\t" << sizeof(st) <<std::endl;
}